-
Notifications
You must be signed in to change notification settings - Fork 0
/
color.go
175 lines (148 loc) · 5.58 KB
/
color.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
package lifx
import (
"context"
"encoding/binary"
"fmt"
"math"
"time"
)
const (
encodedColorLength = 2 + 2 + 2 + 2 // four uint16s
)
// Color represents a single HSBK value.
//
// https://lan.developer.lifx.com/docs/field-types#color
type Color struct {
Hue, Saturation, Brightness uint16
Kelvin uint16
}
// encode writes the color into the given destination slice.
// The caller must ensure len(dst) is at least encodedColorLength.
func (c *Color) encode(dst []byte) {
binary.LittleEndian.PutUint16(dst[0:2], c.Hue)
binary.LittleEndian.PutUint16(dst[2:4], c.Saturation)
binary.LittleEndian.PutUint16(dst[4:6], c.Brightness)
binary.LittleEndian.PutUint16(dst[6:8], c.Kelvin)
}
func (c *Color) decode(b []byte) {
c.Hue = binary.LittleEndian.Uint16(b[0:2])
c.Saturation = binary.LittleEndian.Uint16(b[2:4])
c.Brightness = binary.LittleEndian.Uint16(b[4:6])
c.Kelvin = binary.LittleEndian.Uint16(b[6:8])
}
func (d *Device) GetColor(ctx context.Context) (Color, error) {
payload, err := d.query(ctx, pktGetColor, pktLightState, nil)
if err != nil {
return Color{}, err
}
if len(payload) != encodedColorLength+2+2+32+8 {
return Color{}, fmt.Errorf("LightState malformed: length=%d", len(payload))
}
var color Color
color.decode(payload[:encodedColorLength])
return color, nil
}
func (d *Device) SetColor(ctx context.Context, color Color, duration time.Duration) error {
dur, err := uint32Millis(duration)
if err != nil {
return err
}
payload := make([]byte, 1+encodedColorLength+4)
color.encode(payload[1 : 1+encodedColorLength])
binary.LittleEndian.PutUint32(payload[1+encodedColorLength:], dur) // duration
return d.set(ctx, pktSetColor, payload)
}
// QuietOn turns on the light power if it isn't already turned on.
// If it wasn't on, the light's brightness will be set to zero first.
func (d *Device) QuietOn(ctx context.Context) error {
power, err := d.GetLightPower(ctx)
if err != nil || power > 0 {
return err
}
// Set to zero brightness, then turn on.
if err := d.SetColor(ctx, Color{Brightness: 0}, 0); err != nil {
return err
}
return d.SetLightPower(ctx, 0xFFFF, 0)
}
func (d *Device) GetExtendedColorZones(ctx context.Context) (zones []Color, err error) {
payload, err := d.query(ctx, pktGetExtendedColorZones, pktStateExtendedColorZones, nil)
if err != nil {
return nil, err
}
if len(payload) < 5 {
return nil, fmt.Errorf("StateExtendedColorZones too short: length=%d", len(payload))
}
zonesCount := int(binary.LittleEndian.Uint16(payload[0:2])) // "The number of zones on your strip"
zoneIndex := int(binary.LittleEndian.Uint16(payload[2:4])) // "The first zone represented in the packet"
colorsCount := int(payload[4]) // "The number of HSBK values in the colors array that map to zones."
colors := payload[5:]
if want := colorsCount * encodedColorLength; want > len(colors) {
return nil, fmt.Errorf("StateExtendedColorZones too short: colorsCount=%d length=%d", colorsCount, len(payload))
} else if want < len(colors) {
colors = colors[:want]
}
// TODO: We don't handle the case where the entire strip's color state is returned
// in a single message. What happens? Will we get multiple StateExtendedColorZones messages?
// The documentation is unclear on this point. Let's proceed under the assumption that
// the zones are all given.
if zonesCount != colorsCount || zoneIndex != 0 {
return nil, fmt.Errorf("can't handle partial/complex StateExtendedColorZones message")
}
zones = make([]Color, colorsCount)
for i := 0; i < colorsCount; i++ {
off := i * encodedColorLength
zones[i].decode(colors[off : off+encodedColorLength])
}
return
}
func (d *Device) SetExtendedColorZones(ctx context.Context, duration time.Duration, zones []Color) error {
if len(zones) > 82 {
return fmt.Errorf("too many zones to set; %d > 82", len(zones))
}
dur, err := uint32Millis(duration)
if err != nil {
return err
}
payload := make([]byte, 4+1+2+1+len(zones)*encodedColorLength)
binary.LittleEndian.PutUint32(payload[0:4], dur) // duration
payload[4] = 1 // apply; MultiZoneExtendedApplicationRequest(APPLY)
binary.LittleEndian.PutUint16(payload[5:7], 0) // zone_index
payload[7] = uint8(len(zones))
for i, off := 0, 8; i < len(zones); i++ {
// The next line doesn't strictly need the second slice arg, but it is a useful sanity check.
zones[i].encode(payload[off : off+encodedColorLength])
off += encodedColorLength
}
return d.set(ctx, pktSetExtendedColorZones, payload)
}
type Waveform int
const (
SawWaveform = Waveform(0)
SineWaveform = Waveform(1)
HalfSineWaveform = Waveform(2)
TriangleWaveform = Waveform(3)
PulseWaveform = Waveform(4)
)
type WaveformConfig struct {
Waveform Waveform
Transient bool
Color Color
Period time.Duration
Cycles float32
// TODO: skew_ratio, if needed. Also, optionality (and use SetWaveformOptional).
}
func (d *Device) SetWaveform(ctx context.Context, cfg WaveformConfig) error {
period, err := uint32Millis(cfg.Period)
if err != nil {
return err
}
payload := make([]byte, 21)
payload[1] = boolInt(cfg.Transient) // transient
cfg.Color.encode(payload[2:10]) // hue, saturation, brightness, kelvin
binary.LittleEndian.PutUint32(payload[10:14], period) // period
binary.LittleEndian.PutUint32(payload[14:18], math.Float32bits(cfg.Cycles)) // cycles; this encoding is a guess
// skew_ratio left at 0 (only used for Pulse), which encodes 0.5.
payload[20] = byte(cfg.Waveform)
return d.set(ctx, pktSetWaveform, payload)
}